A) $ a_1b_2-b_1a_2=0 $
B) $ a_1a_2+b_1b_2=0 $
C) $ a_1^{2}b_2+b_1^{2}a_2=0 $
D) $ a_1b_1+a_2b_2=0 $
Correct Answer: B
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Answer:
Solution:
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